`noise`¶

A stack of fractal noise layers added to the terrain, for hills, ridges and rolling relief.

stack[]: Noise layers, 1 to 8, combined in order: the first enabled layer sets the height and each later one is combined with it by its blend mode.

Key	Type	Default	Range	Unit	Description
`enabled`	boolean	`true`			Includes this layer in the stack; disabled layers are skipped.
`basis`	one of `perlin`, `simplex`, `value`, `worley_f1`, `worley_f2`, `worley_f2_minus_f1`, `voronoi`	`"perlin"`			Single-octave noise the fractal is built from.
`fractal`	one of `fbm`, `ridged`, `billow`, `hybrid_multifractal`	`"fbm"`			How the octaves of the basis noise are combined.
`blend`	one of `add`, `max`, `min`, `mask`	`"add"`			How this layer combines with the height of the layers before it; the first enabled layer sets the height instead.
`seed`	integer	`0`			Seed of the noise; changing it gives a different pattern of the same character.
`wavelength`	number	`1000.0`	(0, inf)	m	Wavelength of the first, broadest octave, in metres; sets the size of the largest features.
`amplitude`	number	`100.0`		m	Largest height of the layer above or below 0, in metres.
`octaves`	integer	`8`	[1, 32]		Number of octaves, at least 1; each one adds detail at a shorter wavelength.
`lacunarity`	number	`2.0`	(1, inf)		Frequency ratio between successive octaves; greater than 1.
`gain`	number	`0.5`	(0, inf)		Weight ratio between successive octaves, greater than 0; higher values give rougher terrain. Unused when the Hurst exponent is set.
`hurst`	number, optional	`null`			Hurst exponent that sets the octave gain to lacunarity^-hurst: near 1 is smooth, lower is rougher at short baselines. Unset uses the gain.
`offset`	number	`1.0`	(0, inf)		Ridge offset of the ridged and hybrid multifractal types; greater than 0.
`warp_amplitude`	number	`0.0`	[0, inf)	m	Domain warp displacement in metres, which bends the noise into swirled shapes; 0 disables warping.
`warp_wavelength`	number	`500.0`	(0, inf)	m	Wavelength of the warp field, in metres.

Every key with its default

{
    "type": "noise",
    "stack": [
        {
            "enabled": true,
            "basis": "perlin",
            "fractal": "fbm",
            "blend": "add",
            "seed": 0,
            "wavelength": 1000.0,
            "amplitude": 100.0,
            "octaves": 8,
            "lacunarity": 2.0,
            "gain": 0.5,
            "hurst": null,
            "offset": 1.0,
            "warp_amplitude": 0.0,
            "warp_wavelength": 500.0
        }
    ]
}

Used in: example_ages_fresh, example_ages_steady_state, example_ages_uniform, example_albedo_blast_zone, example_albedo_crater_rays, example_albedo_fresh_crater, example_albedo_moon_site, example_albedo_new_crater and 64 more

noise¶

`noise`¶